In the Austrian town of Fyushl am See, researchers have unearthed something very similar to the 2800-year-old Mesopotamian clay cell phone (if judged by the quality of the photos, the researchers themselves are slightly newer models).
According to published on the highly respected site misteriousuniverse.org information is unknown exactly what you were looking for archaeologists, when met with this handset like Nokia artifact, but their original purpose was not exactly the Sumerian clay mobiles.
How phone with tapered shirts hit the modern Austria, you ask? In the end, Mesopotamia never extended to the north or west of the territory of modern Turkey. The authors of the news suggests that aliens created the Sumerian civilization, but were forced to hide the artifact after a failed attempt to attach people to the mobile.
Unfortunately, modern science is still unknown technology that allows mobile phones to work with clay.